Industrial double-suction centrifugal fan

Abstract

The invention discloses an industrial double-suction centrifugal fan, and relates to the technical field of industrial fans. A mounting plate is fixedly connected to the top of the bottom plate, a motor is fixedly connected to the top of the mounting plate, a first belt wheel is fixedly connected to an output shaft of the motor, an air box is fixedly connected to the top of the bottom plate, and a side plate is fixedly connected to the top of the bottom plate; the side faces of the side plates penetrate through and are rotationally connected with a center rotating shaft, the circumferential face of the center rotating shaft is fixedly connected with an impeller, the top of the bottom plate is fixedly connected with a supporting plate, the side face of the supporting plate is fixedly connected with a protective cover, and the side face of the air bellow is provided with an air guiding and filtering structure. Through the arrangement of the air guiding and filtering structure, air entering the air bellow can be effectively filtered, impurities and dust are prevented from entering the fan, the service life of the fan is prolonged, the working efficiency of the fan is improved, blocking of the filter screen is prevented, and air inlet smoothness is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of industrial fan technology, specifically to an industrial double-suction centrifugal fan. Background Technology

[0002] In industrial production, fans are widely used in various fields as important ventilation and air exchange equipment. However, traditional industrial fans often encounter problems during long-term operation, such as impurities and dust entering the fan's interior. This not only shortens the fan's lifespan but also reduces its operating efficiency.

[0003] According to a public disclosure (publication number: CN222924637U), a dual-suction multi-blade centrifugal fan with filter is provided, comprising an integrally formed shell and an exhaust pipe. Symmetrical air inlets are provided on both sides of the shell, and a mounting bracket is installed at each air inlet. A fan motor is installed between two mounting brackets, and an impeller is fixed to the outer wall of the fan motor. Each mounting bracket has a slot on its surface. During operation, air enters the shell from both sides, providing sufficient airflow. Filters are installed at both air inlets, and the filters are securely fixed by positioning frames to prevent external debris from entering the shell. Three filters form a circular filter that covers the air inlets. Each filter can be installed and removed individually; when a filter is damaged, the corresponding filter can be replaced, saving maintenance costs. The filters are easy to clean after disassembly. This invention has a simple structure and is convenient to use.

[0004] While the aforementioned application demonstrates that installing a filter at the air inlet can filter the air entering the fan to some extent, it still has many shortcomings in actual use. After prolonged use, impurities and dust accumulate on the filter surface, easily causing clogging and affecting the smoothness of air intake, thereby reducing the working efficiency of the fan. Even if the filter can be disassembled, frequent disassembly and cleaning of the filter in industrial fans is extremely inconvenient, not only consuming a lot of manpower and time, but also potentially causing additional damage to the fan due to improper operation during disassembly and installation. Therefore, we propose an industrial double-suction centrifugal fan. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an industrial double-suction centrifugal fan, which solves the problems mentioned in the background section.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an industrial double-suction centrifugal fan, comprising a base plate, a mounting plate fixedly connected to the top of the base plate, a motor fixedly connected to the top of the mounting plate, a pulley fixedly connected to the output shaft of the motor, a wind box fixedly connected to the top of the base plate, a side plate fixedly connected to the top of the base plate, a central rotating shaft rotatably connected through the side of the side plate, an impeller fixedly connected to the circumferential surface of the central rotating shaft, a pulley two fixedly connected to one end of the central rotating shaft, a belt provided on the circumferential surface of the pulley two, a support plate fixedly connected to the top of the base plate, a protective cover fixedly connected to the side of the support plate, and an air guiding and filtering structure provided on the side of the wind box.

[0007] The air-guiding and filtering structure includes an air guide hood, which is fixedly connected to the side of the air box. A filter screen is fixedly connected to the side of the air guide hood. A motor is fixedly connected to the side of the air guide hood, and a drive gear is fixedly connected to the output shaft of the motor. A stroke plate is fixedly connected to the side of the air guide hood. A reciprocating lead screw is rotatably connected to the side of the stroke plate. A driven gear is fixedly connected to one end of the reciprocating lead screw. A threaded sleeve is threaded to the circumferential surface of the reciprocating lead screw. A moving plate is fixedly connected to the circumferential surface of the threaded sleeve. A limit plate is fixedly connected to the side of the moving plate. A rotating shaft is rotatably connected to the side of the moving plate. A scraper is fixedly connected to one end of the rotating shaft. An angle column is fixedly connected to the scraper. A spring is fixedly connected to the side of the rotating shaft. A limit rod is fixedly connected to the side of the air guide hood. A rubber strip is provided on the side of the scraper.

[0008] According to the above technical solution, a dirt-collecting shell is fixedly connected to the side of the air guide hood, the inner side of the limiting rod abuts against the side of the limiting plate, and the side of the scraper abuts against the side of the filter screen to scrape and clean the surface of the filter screen, effectively preventing the filter screen from clogging and ensuring smooth air intake.

[0009] According to the above technical solution, the end of the spring away from the rotating shaft abuts against the side of the moving plate, the rubber strip is positioned near the top of the scraper side, and the side of the moving plate abuts against the inner wall of the travel plate, ensuring that the moving plate moves stably under the drive of the reciprocating screw without deviation. The driving gear and the driven gear mesh with each other, and the number of teeth on the driving gear is less than the number of teeth on the driven gear, so that the rotational speed of the driven gear is lower than that of the driving gear, thereby reducing the rotational speed of the reciprocating screw and making the scraper scrape the filter screen more finely and thoroughly.

[0010] According to the above technical solution, the driving gear and the driven gear mesh with each other, the number of teeth of the driving gear is less than the number of teeth of the driven gear, the side section of the limiting plate is set as semi-circular, and the inner wall of the limiting plate is slidably connected to the circumferential surface of the angle column, so that when the angle column slides in the limiting plate, it can drive the scraper to swing within a certain angle range, thereby better adapting to the shape of the filter screen surface and improving the scraping effect.

[0011] According to the above technical solution, pulley one and pulley two are connected by belt drive. The impeller is located inside the wind box. After the motor starts, the central shaft and impeller are driven to rotate inside the wind box through the transmission of pulley one, belt and pulley two, generating wind power.

[0012] According to the above technical solution, a pneumatic dust collection structure is provided at the end of the reciprocating screw away from the driven gear. The pneumatic dust collection structure includes a disc, which is fixedly connected to the end of the reciprocating screw away from the driven gear. A first connecting rod is hinged to the side of the disc, and a second connecting rod is hinged to the end of the first connecting rod away from the disc. A piston block is hinged to the end of the second connecting rod away from the first connecting rod. A piston cylinder is slidably connected to the circumferential surface of the piston block. A connecting pipe is fixedly inserted through the bottom of the piston cylinder. An air jet disc is provided on the inner wall of the dust collection shell, and a one-way valve is fixedly inserted through the bottom of the piston cylinder to blow away large dust particles inside the dust collection shell, allowing them to concentrate on the outside for easy subsequent collection and processing.

[0013] According to the above technical solution, the circumferential surface of the piston cylinder is fixedly connected to the side of the air guide shroud, and the end of the connecting pipe away from the piston cylinder is fixedly connected to the side of the jet disc to ensure the stable fixation of the piston cylinder.

[0014] According to the above technical solution, the one-way valve is unidirectionally open at the end away from the piston cylinder, ensuring that when the piston cylinder compresses gas, the gas can only be ejected from the jet disc and will not flow back into the piston cylinder, thereby improving the working efficiency of the pneumatic dust collection structure.

[0015] According to the above technical solution, a wind direction adjustment structure is provided on the top of the wind box. The wind direction adjustment structure includes a telescopic cylinder, which is fixedly connected to the side of the wind box. A sliding block is fixedly connected to the telescopic end of the cylinder. An outer cover is fixedly connected to the side of the wind box, and a wind vane is slidably connected to the inner wall of the outer cover. When the telescopic cylinder extends or retracts, it drives the sliding block to move, which in turn drives the wind vane to slide within the outer cover. By controlling the extension and retraction of the telescopic cylinder, the position of the wind vane can be adjusted to meet the wind direction requirements under different working conditions.

[0016] According to the above technical solution, the number of outer covers is set to two sets. The side of the wind plate is connected to the side of the wind box through and slidably. The side of the sliding block is fixedly connected to the side of the wind plate, so that the wind plate is more stable during the sliding process and there will be no deviation or jamming, thus ensuring the accuracy and reliability of wind direction adjustment.

[0017] This invention provides an industrial double-suction centrifugal fan. It has the following beneficial effects: (1) The present invention enables the air entering the air box to be effectively filtered by setting the air guide filter structure, thereby preventing impurities and dust from entering the fan, thus extending the service life of the fan and improving its working efficiency. The scraper in the air guide filter structure can automatically scrape and clean the filter screen, preventing the filter screen from being blocked and ensuring the smoothness of air intake.

[0018] (2) The present invention, through the setting of the pneumatic dust collection structure, enables the active blowing and cleaning of large dust particles accumulated in the dust collection shell during the operation of the fan. When the reciprocating screw drives the disc to rotate, the piston block reciprocates in the piston cylinder through the transmission of the first and second connecting rods, thereby generating compressed air. This compressed air is delivered to the jet plate through the connecting pipe and is evenly sprayed out from multiple jet holes on the jet plate, blowing the dust on the inner wall of the dust collection shell and concentrating it in the outer collection area.

[0019] (3) The present invention allows the air outlet direction of the fan to be flexibly adjusted according to actual needs by setting the air direction adjustment structure. The telescopic cylinder serves as the power source, and the movement of its telescopic end drives the sliding block to move linearly. The sliding block is fixedly connected to the air plate, so the air plate will slide inside the outer cover as the sliding block moves. Since the outer cover is connected to the side of the air box through and slidingly, the movement of the air plate directly changes the opening size and direction of the air box outlet, thereby realizing the adjustment of the air direction. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall three-dimensional front view of the present invention; Figure 2 This is a schematic diagram of the overall three-dimensional cross-section of the present invention; Figure 3 This is a schematic diagram of the overall three-dimensional side view of the present invention; Figure 4 This is a three-dimensional magnified structural diagram of the present invention; Figure 5 This is a schematic diagram of the three-dimensional air-guiding filter structure of the present invention; Figure 6 This is a schematic diagram of the three-dimensional pneumatic dust collection structure of the present invention; Figure 7 This is a schematic diagram of the three-dimensional wind direction adjustment structure of the present invention.

[0021] In the diagram: 1. Base plate; 2. Mounting plate; 3. Motor; 4. Pulley 1; 5. Air box; 6. Side plate; 7. Central shaft; 8. Impeller; 9. Pulley 2; 10. Belt; 11. Support plate; 12. Protective cover; 13. Air guide and filter structure; 131. Air guide cover; 132. Filter screen; 133. Motor; 134. Drive gear; 135. Stroke plate; 136. Reciprocating screw; 137. Driven gear; 138. Threaded sleeve; 139. Moving plate; 140. Limiting plate; 141. Rotating shaft; 142. Scraper; 143. Angle column; 144. Spring; 145. Limiting rod; 146. Rubber strip; 14. Dirt hopper; 15. Pneumatic dust collection structure; 151. Disc; 152. First connecting rod; 153. Second connecting rod; 154. Piston block; 155. Piston cylinder; 156. Connecting pipe; 157. Jet disc; 158. One-way valve; 16. Air direction adjustment structure; 161. Telescopic cylinder; 162. Sliding block; 163. Outer cover; 164. Air vane. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0023] Please see Figures 1-7 One embodiment of the present invention is as follows: an industrial double-suction centrifugal fan includes a base plate 1, a mounting plate 2 fixedly connected to the top of the base plate 1, a motor 3 fixedly connected to the top of the mounting plate 2, a pulley 4 fixedly connected to the output shaft of the motor 3, a wind box 5 fixedly connected to the top of the base plate 1, a side plate 6 fixedly connected to the top of the base plate 1, a central rotating shaft 7 rotatably connected through the side of the side plate 6, an impeller 8 fixedly connected to the circumferential surface of the central rotating shaft 7, a pulley 9 fixedly connected to one end of the central rotating shaft 7, a belt 10 provided on the circumferential surface of the pulley 9, a support plate 11 fixedly connected to the top of the base plate 1, a protective cover 12 fixedly connected to the side of the support plate 11, and an air guiding and filtering structure 13 provided on the side of the wind box 5.

[0024] The air guide and filter structure 13 includes an air guide shroud 131, which is fixedly connected to the side of the air box 5. A filter screen 132 is fixedly connected to the side of the air guide shroud 131. A motor 133 is fixedly connected to the side of the air guide shroud 131. A drive gear 134 is fixedly connected to the output shaft of the motor 133. A stroke plate 135 is fixedly connected to the side of the air guide shroud 131. A reciprocating screw 136 is rotatably connected to the side of the stroke plate 135. A driven gear 137 is fixedly connected to one end of the reciprocating screw 136. A threaded sleeve 138 is threadedly connected to the circumferential surface of the sleeve 138. A movable plate 139 is fixedly connected to the circumferential surface of the sleeve 138. A limit plate 140 is fixedly connected to the side of the movable plate 139. A rotating shaft 141 is rotatably connected through the side of the movable plate 139. A scraper 142 is fixedly connected to one end of the rotating shaft 141. An angle column 143 is fixedly connected to the scraper 142. A spring 144 is fixedly connected to the side of the rotating shaft 141. A limit rod 145 is fixedly connected to the side of the air guide shroud 131. A rubber strip 146 is provided on the side of the scraper 142.

[0025] A dirt-collecting shell 14 is fixedly connected to the side of the air guide shroud 131. The inner side of the limiting rod 145 abuts against the side of the limiting plate 140. The side of the scraper 142 abuts against the side of the filter screen 132, scraping and cleaning the surface of the filter screen 132, effectively preventing the filter screen 132 from clogging and ensuring smooth air intake.

[0026] The end of spring 144 away from the rotating shaft 141 abuts against the side of the moving plate 139. Rubber strip 146 is positioned near the top of the side of scraper 142. The side of the moving plate 139 abuts against the inner wall of the stroke plate 135, ensuring stable movement of the moving plate 139 under the drive of the reciprocating screw 136 without deviation. The driving gear 134 and driven gear 137 mesh with each other, and the number of teeth in the driving gear 134 is less than that in the driven gear 137. This results in the driven gear 137 rotating at a lower speed than the driving gear 134, thereby reducing the speed of the reciprocating screw 136 and allowing the scraper 142 to scrape the filter screen 132 more thoroughly and meticulously.

[0027] The driving gear 134 and the driven gear 137 mesh with each other. The number of teeth of the driving gear 134 is less than the number of teeth of the driven gear 137. The side section of the limiting plate 140 is set as semi-circular. The inner wall of the limiting plate 140 is slidably connected to the circumferential surface of the angle column 143, so that when the angle column 143 slides in the limiting plate 140, it can drive the scraper 142 to swing within a certain angle range, thereby better adapting to the shape of the filter screen 132 surface and improving the scraping effect.

[0028] Pulley 4 and pulley 9 are connected by belt 10. Impeller 8 is located inside wind box 5. After motor 3 starts, it drives the central shaft 7 and impeller 8 to rotate inside wind box 5 through the transmission of pulley 4, belt 10 and pulley 9, generating wind power.

[0029] In use, the operator connects the industrial double-suction centrifugal fan to a power source. The motor 3 starts and drives pulley 4 to rotate. Through the transmission of belt 10, pulley 9 rotates accordingly, which in turn drives the central shaft 7 and impeller 8 to rotate at high speed within the air box 5, generating a strong suction force. Simultaneously, the motor 133 in the air guide filter structure 13 also starts, driving the drive gear 134 to rotate. Since the drive gear 134 meshes with the driven gear 137, the driven gear 137 rotates accordingly, which in turn drives the reciprocating screw 136 to rotate. The rotation of the reciprocating screw 136 causes the threaded sleeve 138 to reciprocate linearly on the screw, thereby moving the moving plate 139 and the scraper 142 fixed thereon. During the movement, the side of the scraper 142 comes into close contact with the side of the filter screen 132, scraping and cleaning the surface of the filter screen 132, effectively preventing clogging and ensuring smooth airflow. Meanwhile, since the side section of the limiting plate 140 is set as semi-circular and its inner wall is slidably connected to the circumferential surface of the angle column 143, and the rubber strip 146 is located on the side of the scraper 142 near the top, the friction at the top is relatively large. When the moving plate 139 moves, the angle column 143 will slide inside the limiting plate 140, thereby driving the scraper 142 to swing within a certain angle range, so as to better scrape off the dust and improve the cleaning effect of the filter screen 132.

[0030] Please see Figures 1-7 Based on the above embodiments, in another embodiment of the present invention, a pneumatic dust collection structure 15 is provided at the end of the reciprocating screw 136 away from the driven gear 137. The pneumatic dust collection structure 15 includes a disc 151, which is fixedly connected to the end of the reciprocating screw 136 away from the driven gear 137. A first connecting rod 152 is hinged to the side of the disc 151. A second connecting rod 153 is hinged to the end of the first connecting rod 152 away from the disc 151. A piston block 154 is hinged to the end of the second connecting rod 153 away from the first connecting rod 152. A piston cylinder 155 is slidably connected to the circumferential surface of the piston block 154. A connecting pipe 156 is fixedly passed through the bottom of the piston cylinder 155. An air jet disc 157 is provided on the inner wall of the dust collection shell 14. A one-way valve 158 is fixedly passed through the bottom of the piston cylinder 155 to blow away large dust particles in the dust collection shell 14, allowing them to concentrate on the outside for subsequent collection and processing.

[0031] The circumferential surface of the piston cylinder 155 is fixedly connected to the side of the air guide shroud 131, and the end of the connecting pipe 156 away from the piston cylinder 155 is fixedly connected to the side of the jet disc 157 to ensure the piston cylinder 155 is stably fixed.

[0032] The one-way valve 158 is unidirectionally open at the end away from the piston cylinder 155, ensuring that when the piston cylinder 155 compresses gas, the gas can only be ejected from the jet disc 157 and will not flow back into the piston cylinder 155, thus improving the working efficiency of the pneumatic dust collection structure 15.

[0033] A wind direction adjustment structure 16 is provided on the top of the bellows 5. The wind direction adjustment structure 16 includes a telescopic cylinder 161, which is fixedly connected to the side of the bellows 5. A sliding block 162 is fixedly connected to the telescopic end of the telescopic cylinder 161. An outer cover 163 is fixedly connected to the side of the bellows 5. A wind vane 164 is slidably connected to the inner wall of the outer cover 163. When the telescopic cylinder 161 extends or retracts, it drives the sliding block 162 to move, and the sliding block 162 in turn drives the wind vane 164 to slide within the outer cover 163. By controlling the extension or retraction of the telescopic cylinder 161, the position of the wind vane 164 can be adjusted to meet the wind direction requirements under different working conditions.

[0034] There are two sets of outer covers 163. The side of the wind vane 164 is connected to the side of the wind box 5 through and slidingly. The side of the sliding block 162 is fixedly connected to the side of the wind vane 164, making the wind vane 164 more stable during sliding and preventing deviation or jamming, thus ensuring the accuracy and reliability of wind direction adjustment.

[0035] In use, the reciprocating screw 136 rotates, driving the disc 151 to rotate. The disc 151, through the first connecting rod 152 and the second connecting rod 153, drives the piston block 154 to reciprocate linearly within the piston cylinder 155. When the piston block 154 moves away from the connecting pipe 156, a negative pressure is formed within the piston cylinder 155, allowing outside air to enter through the one-way valve 158. When the piston block 154 moves closer to the connecting pipe 156, the air within the piston cylinder 155 is compressed and ejected from the jet disc 157 through the connecting pipe 156, sweeping away large dust particles within the dust collection shell 14 and concentrating them on the outside for easier subsequent collection and processing. The telescopic cylinder 161 extends and retracts according to working conditions, driving the sliding block 162 to move. The sliding block 162 then drives the air deflector 164 to slide within the outer cover 163, adjusting the position of the air deflector 164 and changing the airflow direction to meet the requirements of different working conditions.

[0036] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An industrial double-suction centrifugal fan, comprising a base plate (1), characterized in that: A mounting plate (2) is fixedly connected to the top of the base plate (1), a motor (3) is fixedly connected to the top of the mounting plate (2), a pulley (4) is fixedly connected to the output shaft of the motor (3), a wind box (5) is fixedly connected to the top of the base plate (1), a side plate (6) is fixedly connected to the top of the base plate (1), a central rotating shaft (7) is rotatably connected through the side of the side plate (6), an impeller (8) is fixedly connected to the circumferential surface of the central rotating shaft (7), a pulley (9) is fixedly connected to one end of the central rotating shaft (7), a belt (10) is provided on the circumferential surface of the pulley (9), a support plate (11) is fixedly connected to the top of the base plate (1), a protective cover (12) is fixedly connected to the side of the support plate (11), and an air guide and filter structure (13) is provided on the side of the wind box (5). The air guide filter structure (13) includes an air guide hood (131), which is fixedly inserted through the side of the air box (5). A filter screen (132) is fixedly inserted through the side of the air guide hood (131). A motor (133) is fixedly connected to the side of the air guide hood (131). A drive gear (134) is fixedly connected to the output shaft of the motor (133). A stroke plate (135) is fixedly connected to the side of the air guide hood (131). A reciprocating screw (136) is inserted through and rotatably connected to the side of the stroke plate (135). A driven gear (137) is fixedly connected to one end of the reciprocating screw (136). A threaded sleeve (138) is threaded to the circumferential surface of the shroud (138). A movable plate (139) is fixedly connected to the circumferential surface of the threaded sleeve (138). A limit plate (140) is fixedly connected to the side of the movable plate (139). A rotating shaft (141) is rotatably connected to the side of the movable plate (139). A scraper (142) is fixedly connected to one end of the rotating shaft (141). An angle column (143) is fixedly connected to the scraper (142). A spring (144) is fixedly connected to the side of the rotating shaft (141). A limit rod (145) is fixedly connected to the side of the air guide shroud (131). A rubber strip (146) is provided on the side of the scraper (142).

2. The industrial double-suction centrifugal fan according to claim 1, characterized in that: The side of the air guide cover (131) is fixedly connected to a dirt scoop (14), the inner side of the limiting rod (145) abuts against the side of the limiting plate (140), and the side of the scraper (142) abuts against the side of the filter screen (132).

3. An industrial double-suction centrifugal fan according to claim 2, characterized in that: The end of the spring (144) away from the pivot (141) abuts against the side of the moving plate (139), the rubber strip (146) is located on the side of the scraper (142) near the top, and the side of the moving plate (139) abuts against the inner wall of the travel plate (135).

4. An industrial double-suction centrifugal fan according to claim 3, characterized in that: The driving gear (134) meshes with the driven gear (137), the number of teeth of the driving gear (134) is less than the number of teeth of the driven gear (137), the side section of the limiting plate (140) is set as semi-circular, and the inner wall of the limiting plate (140) is slidably connected to the circumferential surface of the angle column (143).

5. An industrial double-suction centrifugal fan according to claim 4, characterized in that: The pulley one (4) and pulley two (9) are connected by a belt (10), and the impeller (8) is located inside the wind box (5).

6. An industrial double-suction centrifugal fan according to claim 5, characterized in that: A pneumatic dust collection structure (15) is provided at the end of the reciprocating screw (136) away from the driven gear (137). The pneumatic dust collection structure (15) includes a disc (151). The disc (151) is fixedly connected to the end of the reciprocating screw (136) away from the driven gear (137). A first connecting rod (152) is hinged to the side of the disc (151). A second connecting rod (153) is hinged to the end of the first connecting rod (152) away from the disc (151). A piston block (154) is hinged to the end of the second connecting rod (153) away from the first connecting rod (152). A piston cylinder (155) is slidably connected to the circumferential surface of the piston block (154). A connecting pipe (156) is fixedly passed through the bottom of the piston cylinder (155). An air jet disc (157) is provided on the inner wall of the dust collection shell (14). A one-way valve (158) is fixedly passed through the bottom of the piston cylinder (155).

7. An industrial double-suction centrifugal fan according to claim 6, characterized in that: The circumferential surface of the piston cylinder (155) is fixedly connected to the side of the air guide shroud (131), and the end of the connecting pipe (156) away from the piston cylinder (155) is fixedly connected to the side of the jet disc (157).

8. An industrial double-suction centrifugal fan according to claim 7, characterized in that: The one-way valve (158) is open only at the end away from the piston cylinder (155).

9. An industrial double-suction centrifugal fan according to claim 8, characterized in that: The top of the wind box (5) is provided with a wind direction adjustment structure (16), which includes a telescopic cylinder (161). The telescopic cylinder (161) is fixedly connected to the side of the wind box (5). A sliding block (162) is fixedly connected to the telescopic end of the telescopic cylinder (161). An outer cover (163) is fixedly connected to the side of the wind box (5). A wind plate (164) is slidably connected to the inner wall of the outer cover (163).

10. An industrial double-suction centrifugal fan according to claim 9, characterized in that: The number of the outer cover (163) is set in two sets. The side of the wind plate (164) is connected to the side of the wind box (5) through and slidably. The side of the sliding block (162) is fixedly connected to the side of the wind plate (164).

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